[R-meta] Compiling different design in the same met-analysis

Dear Gladys

Comments in-line

On 03/05/2021 08:13, Gladys Barragan-Jason wrote:

Dear all,

I am doing a meta-analysis on experimental data on the impact on
several behavioral interventions including both *pre-post studies*
(measurement of a trait before and after the intervention) *and control
vs. treatment studies *(measurement after a control intervention vs.
measurement after the intervention).

So the first design just has one group which is measured twice and the
second design has two parallel groups which are each measured once?

I am interested in the effect size of each type of intervention on a
specific trait that is common to all studies.

I would like to know whether it is correct to compile all studies from
one type of intervention (whatever the type of comparisons: pre-pot and
control vs. treatment group together) with pre- and control being as
control and post and treatment being as treatment.

I do not think that is going to work well. Although the two designs
could be considered as estimating the same effect their variability
should be very different since in design 1 you have reduced the effect
of individual variability. If you do include both designs in one
analysis I would have thought it mandatory to include a moderator with
two levels for design.

I have a second question about how to thank the
r-sig-meta-analysis at r-project.org
<mailto:r-sig-meta-analysis at r-project.org> list for all their help
(acknowledgements in a paper).

I would have thought the URL

Michael

Thanks a lot for your help!

Have a great day,

Gladys

--

------------------------------------------

Gladys Barragan-Jason, PhD. ____ Website
<https://sites.google.com/view/gladysbarraganjason/home>

Station d'Ecologie Th?orique et Exp?rimentale (SETE)____

CNRS de Moulis____

image.pngimage.png____




<

http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>

      Virus-free. www.avg.com
<

http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient>

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

--
Michael
http://www.dewey.myzen.co.uk/home.html